Career
He represented Beauharnois in the Canadian House of Commons as a Conservative member from 1867 to 1872 and again in 1878. He was born in Kilkenny, Ireland and educated at Saint Hyacinthe, Quebec. Cayley studied law and was called to the bar in 1864.
He practised law in Beauharnois.
He was elected to the House of Commons in 1867 but defeated in 1872. Cayley died in Montreal less than three months after being reelected in 1878 at the age of 36.